Duncan moeeison



'geiten tats .ate'ntffite DUNCAN MORRISON, OF PORTLAND, .ll/IAINE.

Letters Patent No. 71,506, dated November 26, 1867,.

l IMPROVEMENT IN APPARATUS FOR CONVBRTING ROTARY INTO REGIPROGATING MOTION.

@Ligt Stimuli teftttet tu im there Enters intmt ,mit mating pitt ai the tame.

TO ALL WHOM IT MAY CONCERN:

Be it lmow-nthat I, DUNCAN MRRISON, of Portland, inthe county of Cumberland, and State of Maine, have invented a new and improved Apparatus for-` Converting Rotary into Recipgocate Motion and I hereby declare the following to be a full, clear, and exact description thereof, which will enable others to make and use my invention, reference being had to the accompanying drawings, forming part of this specification, in which- Figure 1 shows a side elevation of my invention.

FigureV 2, an endA elevation of the same.

My invention consists of thev combination o'f a swinging weighted arm moving a horizontal shaft, upon which is rigidly set a geared wheel, with a second shaft and gear, there being upon this second shaft a wheel, from whose motion or revolution movement is imparted to the saw. The weighted armor lever has a horizontal handle, by which it is first set in motion. l

My invention also consists of a device for throwing the twogeared wheels ont of gear when-desired.

I will now ,more particularly describe my invention, and make particular reference to the accompanying drawings. l

A shows a frame or support, upon which. the devices comprised in my invention are set. b shows the swinging arm, and a the weight on the lower end thereof. vThis arm is rigidly attached to the shaft c, so that the swinging of the arm gives a corresponding motion to the shaft. d shows the gear on the shaft e, and e that on the shaft f. The ends of these shafts rest in box'es provided for their reception, and indicated in the drawings. h shows a. wheel rigidly attached to the end of the shaft f. Ou the side of this Wheel are `made holes for the reception ofthe bent end of the connecting-rod z', which is united with the saw-frame k. By swinging the weighted arm b, by means of the hand-lever m, motion isimparted to the shaft e, thence, by the gears cl and e, to the shaft f, and thence, by the wheel L and connectingrod1', t'o the saw-frame 7c. The swinging motion of the weighted arm b is thus made to move-the saw upward and downward alternately. The movement of the saw-frame is regulated by guide-rods n., set vertically in'the brackets odo. As considerable force must be exerted to stop the motion of the weighted arm b when once in motion, i't is more convenient to have a means of sepaf fw' rating the two gears @Zand e when it is desired to stop the motion of the saw. This I effect by means of the lever p and sliding bed r, upon which one end of the shaft f is placed. This lever is connected with thebed by the bolts, and has its fulcrum onV the bolt t, set into the main frame. By pushing the lever backward, the bed 1' so moves as to separate the wheels e and (Land thus cheek the movement of the saw-frame 7c.

My invention is intended to'be operated by hand by means of the lever-m. By irst imparting the swinging motion to the weighted arm, and continuing the same, motion isvgiven to the saw-frame le and the saw therein.

The sweep of the frame 7c can be increased or'diminished by the relative diameters of-the gears d and e, and by the diierent positions, relative Ato the centre, at which the connecting-rcd z' is united with the wheel h.

I am aware of Letters Patent to A. Slevin, March 30, 1858, and William Barnheard, April 13, 1825, and I do not claim a weighted swinging arm or pendulum for the'purpose of causing a rotary motion; neither do l claim the combination of'two gears and shafts; neither do I claim moving the saw by a'crank. i

What I claim as my invent-ion, and desire to secure byLetters Patent, isv The arrangement of the several devices hereinbefore described, to wit, the swinging arma b, shaft c, gear d, shaftf, wheel it, gear e, connecting-rod z', saw-frame k, leverp, bed 1', in andupon the frame A, to constitute a convenient means of working a. wood-sa\ v, substantially as specified. i

-nw K A, DUN CAN MORRISON.

Witnesses WILLIAM Hawaiiy CLIFFRD, HENRY C. HOUSTON. 

